Ashley is a young witch-in-training who lives in a haunted mansion in Diamond City, making her debut as an employee of WarioWare, Inc. in WarioWare: Touched! She is typically accompanied by her familiar, a small shape-shifting imp named Red, who commonly takes the form of her magic wand. She is depicted as aloof and studious with her magic, though her spells often backfire due to her lack of experience. She is also very quick to anger, though she otherwise shows little emotion. Despite this, her theme song reveals that she considers herself lonely, ultimately wanting to have more friends.

When summoned, Ashley conjures up a cloud with an area of effect using her wand. Any enemies caught in the cloud will move slowly and take damage; a variety of other random effects can also occur, such as characters becoming invisible, food damaging fighters instead of healing them and even making recovery moves unable to work and instead take them to the helpless animation. In the Wii U version, Ashley's hair and eyes turn white and red respectively when she conjures the cloud. Unlike her appearance in the WarioWare games, she does not have any voice clips.

Outside of her above appearances, Ashley's Song reappears as music in both versions of Smash 4, as music on WarioWare Inc. in the 3DS version and music on Gamer in the Wii U version. While both English and Japanese versions are available on Gamer, only one variant is available on WarioWare, depending on the region.

This young witch-in-training lives in a haunted mansion in Diamond City. She's shy and quick to anger, but secretly she wants more friends. When she appears on the battlefield, she will summon a damaging zone of darkness around her. The zone causes a variety of effects, none of them good.

Who's the girl next door living in the haunted mansion? You'd better learn her name, 'cause she's Aa-ashley! This little witch loves cursing people, but also wants more friends. Talk about wanting to have your cake and eat it, too... In battle, she conjures a zone of darkness that both damages and shrinks other fighters!

Ashley returns as an Assist Trophy in Super Smash Bros. Ultimate, functioning identically to her Smash 4 appearance. She is sporting her pure red eyes from WarioWare Gold as opposed to pitch black ones from Game & Wario, though she retains her dark leggings, outfit and shoes from the latter. Training Mode describes her Assist Trophy with the following: Creates a cursed zone of darkness. Unable to be KO'd.

Ashley also appears as a neutral spirit with 13,700 power in World of Light, where she is fought as a Mii Swordfighter in the Ashley outfit and wig. In the battle, Ashley can appear as a hostile Assist Trophy, left and right controls reverse, and magic attacks aren’t very effective against the enemy. During the battle, the player must first fight a tiny red Ridley, which is a reference to Ashley’s familiar, Red.

Ashley, as a spirit, is a Legend Support Spirit. She has a cost of 2 slots and her trait is that she increases the player's Final Smash Meter charge rate.